<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div{
            background-color: #8bc34a;
            width: 400px;
            height: 100px;
        }
    </style>
</head>
<body>

<div>内部样式表</div>

</body>
</html>